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Sizheng pickups, as the leader in audio monitoring in China, continuously innovate in technology to provide the highest quality audio monitoring equipment for China Security. Whether it is the municipal public prosecution law, government agencies, financial institutions, standardized test centers, etc., microphones are needed. Sizheng's internal structure adopts a pure digital noise reduction integrated circuit, and it analyzes the principle of noise reduction with DSP floating-point technology, as well as echo processing technology. It features ultra-high fidelity, ultra-clear voice, and long transmission distance. The acquisition range can also be adjust. The unique design of floating-point digital noise reduction scheme effectively filters out ambient noise, significantly improves the filtering of dynamic noise, and can be used normally in noisy environments. The sound is also processed through voice optimization to maintain rich treble and make playback recording more realistic. , Sizheng pickup also added AGC automatic gain control circuit to enhance long-distance sound, the products are in the forefront level in China. 
One, think positive pickup features:
1, floating point patented technology, high-definition capture complete sound.
2, professional noise automatic identification technology and ALC control technology, DAP digital sound effects, completely shielded ambient noise.
3, high fidelity, high sensitivity, high bandwidth, low noise, built-in efficient exciter.
4, automatic adjustment of high-intensity sound and instant shock, reliable protection of the back-end audio monitoring equipment.
5, -20 °C ~ 70 °C super ambient temperature work to ensure the back end of high-quality recording.
6, integrated professional pre-audio amplification processing circuit, direct drive active speakers, hard disk recorders, headphones and so on.
Second, the selection of the installation position of the pickup , the ceiling ceiling or ceiling installation 2, the wall hanging installation 3, desktop embedded installation 4, buried wall concealed installation Note: The installation location as far as possible to the conversation area as the center. For example, the interrogation room can be installed near the person being tried; the classroom can be installed near the podium; and the small meeting room can be installed at the center of the ceiling, which is better. Installation principle: Try to get close to the main conversation area. This kind of pick-up effect is better.
Third, the pickup (PU) to select connecting cables and wiring <br> <br> pickup core 4 can use ordinary telephone lines, network category 5 twisted pair, shielded / unshielded cable signals. Considering the complex construction environment, it is recommended to use a 0.5mm2 cross-section 3-core signal cable (ie a commonly used 3x0.5RVVP cable).
Power supply for pickups is generally divided into two types:
1, independent power supply, the signal is transmitted with 2 × 0.5RVVP cable.
2, centralized power supply, with 3 × 0.5RVVP core cable, respectively, power supply is positive, audio signal, public grounds. Shielded cables can be used in electromagnetic complex environments where the shielding layer is connected to the equipment ground. That is, the shield net at one end of the pickup (pickup) is suspended, and the shielded network at the device end is connected to the device ground (chassis). Note: It is best to route the cables separately. Do not use the same cable tray with strong AC power, and try to keep away from strong electromagnetic interference devices such as transformers and luminaire rectifiers.
3. How to choose the power supply When installing, consider the power supply efficiency and line loss. Try to use a power supply with a higher nominal value. The DC stabilized power supply referred to here is often referred to as a "linear transformer," which is generally composed of a power transformer, a rectifier diode, a filter capacitor, and an integrated voltage regulator. Try not to use the switching power supply as much as possible, it may cause a lot of circuit noise! Many of the switching power supplies on the market are of poor quality and the ripple coefficient is very large, which can cause the pickups to buzz.
Sizheng pickup consists of microphone (microphone) and amplifier to form the smallest system of pickups. The design of the circuit and the chip used have a great influence on the sound quality. The general pickup uses three-wire system, positive power supply, positive audio output, and common ground. Pickup products are generally classified into two types: active and passive; performance is mainly monitored by pickups.